From the Super Mario Wiki, the Mario encyclopedia
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World 2-B is the second secret level of World 2 in New Super Mario Bros. 2. This level is filled with Para-bombs from the sky and from cannons. There are also small hills on the desert floor which, when destroyed with a Bob-omb, will release items such as coins. Pokeys are also common here.
To unlock this level, the player needs to locate the secret exit in World 2-Ghost House.
Mario begins on the desert next to a pool of quicksand, where a Para-bomb parachutes down to several ? Blocks containing a Fire Flower. A Pokey can then be found on a platform in-between quicksand pools with orange platforms above it, where another Bob-omb falls. More Bob-ombs and Pokeys can be found, along with another ? Block containing a Fire Flower. Cannons then begin to appear on a structure. This is followed by the Checkpoint Flag and ? Blocks containing a coin and a Fire Flower. There is a ? Switch in the middle Brick Block above the next cannon which makes two Coin Roulette Blocks appear for a limited time. More cannons follow, along with a Pokey. A Red Ring can be found on several orange platforms that follow, which causes eight Red Coins to parachute down along with Para-bombs. Three more cannons come after that, followed by the Goal Pole.
Completing this level unlocks World 2-Castle, skipping World 2-4 and World 2-5.